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Apache Axis is an open source,
XML based Web service framework. It consists of
a Java and a C++ implementation of the SOAP server,
and various utilities and APIs for generating
and deploying Web service applications. Using
Apache Axis, developers can create interoperable,
distributed computing applications. Axis is developed
under the auspices of the Apache Software Foundation.
Axis for Java
When using the Java version of Axis there are
two ways to expose Java code as webservice. The
easiest one is to use Axis native JWS (Java Web
Service) files. Another way is to use custom deployment.
Custom deployment enables you to customize resources
that should be exposed as webservice.
See also Apache Axis2.
JWS Webservice creation
JWS files contain Java class source code that
should be exposed as webservice. The main difference
between an ordinary java file and jws file is
the file extension. Another difference is that
jws files are deployed as source code and not
compiled class files.
The following example is taken from
http://ws.apache.org/axis/java/user-guide.html#PublishingWebServicesWithAxis.
It will expose methods add and subtract of class
Calculator.
public class Calculator {
public int add(int i1, int i2) {
return i1 + i2;
}
public int subtract(int i1, int i2)
{
return i1 - i2;
}
}
JWS webservice deployment
Once the Axis servlet is deployed, you need only
to copy the jws file to the Axis directory on
the server. This will work if you are using a
Jakarta Tomcat container. In the case that you
are using another web container, custom WAR archive
creation will be required.
JWS webservice access
JWS webservice is accessible using the URL "http://localhost:8080/axis/Calculator.jws".
If you are running a custom configuration of Jakarta
Tomcat or a different container, the URL might
be different.
Custom deployed webservice
Custom webservice deployment requires a specific
deployment descriptor called WSDD (Web Service
Deployment Descriptor) syntax. It can be used
to specify resources that should be exposed as
webservices. Current version (1.3) supports
RPC services
EJB - stateless (Enterprise Java Bean)
Automated generation of WSDL
When a Webservice is exposed using Axis it will
generate a WSDL file automatically when accessing
the webservice URL with ?WSDL appended to it.
Axis for C++
An example for implementing and deploying a simple
web-service with the C++ version of Axis can be
found in the Axis-CPP Tutorial (link in the Reference
section below).
The steps necessary are:
Create the wsdl file
Generate client and server stubs using wsdl2ws
Provide the server side web service implementation
(e.g. the add method of the calculator service)
Build the server side code and update the generated
deploy.wsdd with the .dll path
Deploy the binaries to the directory specified
in the wsdd
Build client
Run and enjoy...
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Apache Axis
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